Switched 56 Operation; Crn (Call Request With Number) - ADTRAN DSU III AR User Manual

Chapter 4. Configuration Overview
CNL (Configuration Local)
This command is used to pass AT commands to the local modem
via the V.25 bis command processor. This allows the DSU III AR to
be configured with AT commands via a synchronous interface. The
command has the following format:
CNL[LOCAL PASSWORD;]AT[ONE OR MORE AT COMMANDS]
A local password may not be required, depending on the present
configuration of the unit. Responses to CNL commands are
returned in the data format currently configured. Possible
responses include VAL and INVn.
CNR (Configuration Remote)
This command is used to pass AT commands over the network to
the remote DSU via the V.25 bis command processor. This allows a
remote DSU III AR to be configured from a synchronous interface.
The command's format is as follows:
CNR[REMOTE PASSWORD;]AT[ONE OR MORE AT COMMANDS]
The remote password may or may not be required depending on
the present configuration of the remote unit. Responses to the CNR
commands are returned in the data format currently configured.
Possible responses include VAL and INVn.

Switched 56 Operation

CRN (Call Request with Number)

When the DSU III AR is configured for SW56 operation, the CRN
command causes the DSU to dial the supplied number. The
command's format follows:
CRN[NUMBER TO BE DIALED]
If no number is included in the command, the number stored in
dial register number 1 is dialed. If no number is provided and no
number is stored in dial register number 1, the DSU III AR
responds with the call failure indication CFINS (Call Failure
Indication Not Stored).
For a DBU unit, this command initiates dialing on the backup
circuit. If the number supplied contains non-dialable digits, they
4-10 DSU III AR User Manual 61202011L1-1